Note 13 - Employee Stock Option and Retirement Plans (Details) - Changes to the Current Estimate of the Vesting Percentage and Related Expense (July 2012 Performance Based [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2014
Financial Performance Level Three [Member]
Note 13 - Employee Stock Option and Retirement Plans (Details) - Changes to the Current Estimate of the Vesting Percentage and Related Expense [Line Items]
Cumulative Catch-up Adjustment		[1]
Remaining Expense to be Recognized	852
Financial Performance Level Four [Member]
Note 13 - Employee Stock Option and Retirement Plans (Details) - Changes to the Current Estimate of the Vesting Percentage and Related Expense [Line Items]
Cumulative Catch-up Adjustment	928	[1]
Remaining Expense to be Recognized	1,524
Financial Performance Level Five [Member]
Note 13 - Employee Stock Option and Retirement Plans (Details) - Changes to the Current Estimate of the Vesting Percentage and Related Expense [Line Items]
Cumulative Catch-up Adjustment	2,149	[1]
Remaining Expense to be Recognized	$ 1,903

[1] Amounts represent the cumulative catch-up adjustment to be recorded if there was a change in the vesting percentage as of November 30, 2014.